Improvement in pipe-couplings



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FRANZ RUDOLPH VVEGMAN, OF HARTFORD, CONNECTICUT, ASSIGNOR TO HIMSELF i AND FREDERICK C. YDEL, OF SAME PLACE.

Letters Ptent No. 91,291, dated June 15, 1869.

IMPROVEMENT IN PIPE-COUPLINGS.

The Schedule referred to in these Letten Patent and making part of the lame.

To all whom z'tmuy concern Be it known that I, FRANZ RUDOLPH WEGMAN, of Hartford, in the county of Hartford, and State' ot' Connecticut, have invented certain new and useful 1mprovcnients in Couplings for Pipes; and I do hereby declare that the following is a full, clear, and exact description thereof, wherebya person skilled in the art canmake and' use the same, reference being had to the accompanying drawings, and to the letters of reference'marked thereon. y

'Like letters in the tigures indicate the same parts.

Figure 1 isa longitudinal section through the middle of my improved coupling.

Figure 2 is an end view of the same from the left otlig. l. v

My invention has for its object, the coupling together of lead and liron pipes, which frequentlybecomes necessary in plumbers work.

Itconsists in a coupling, c, of cast-iron, or other metal,

c into which the ends of thepipes are secured by means of right and left-handed screw-threads, a and b, each of which .extends about halfway into the coupling; but my-invention dii'ersfrom an ordinary pipe-coupling in having one ofthe threads b cut upon a taper, diminishing from the outside towards the middle. Into thista per nur, a lead pipe can he screwed and held fast without any thyeadrhaving been previously cut upon it.

Au ordinary leadpipe cannot be screwed tightly into a cylindrical thread, as -the metal is so soft that the part already entered into the nut, works loose by the turning, and soon tears off the thread already formed, it' the turning is continued. My improved coupling, on the contrary, will hold the pipe rmly, and the thread will not strip. r

The operation of my improved coupling is as folrows:

Then it is desired to connect the ends of an iron and alead pipe, the two ends are entered into the coupling in the ordinary manner, a screw-thread correspondl ing to that ofthe coupling having been previously cut upon the iron pipe, and the coupling is then turned up 

